A person who enjoys having surgery is often referred to as a "voluntary" or "elective" surgery enthusiast. This term distinguishes them from individuals who undergo surgery out of medical necessity. Additionally, they may be described as having a preference for cosmetic or aesthetic procedures. It is important to consider the motivations and psychological factors behind their desire for surgery.
you call them bitefull
belligerent
a traveller...
a geologist
Pyromaniac.
geek
a traveller...
sharp
There is no special name for a person who likes squirrels.
How about a "gun enthusiast"?
a troublemaker?
blademaniac